Newly supported elements and attributes

Sandbox

The sandbox attribute enables security restrictions for iframe elements that contain untrusted content. These restrictions enhance security by preventing untrusted content from performing actions that can lead to potentially malicious behavior.

Selection API

The selection object represents the active selection, which is typically a highlighted block of text or other elements in the document. The active selection can be used to complete an action issued by a user or a script.

Video

Using HTML5 video you can embed a full featured video player on your webpage without requiring a third-party plug-in or JavaScript.